:const is not recognized at compile time if quoted

```common-lisp
(%skia:get-family-name
     ':const
     '(claw-utils:claw-pointer %skia:sk-typeface) typeface
     '(claw-utils:claw-pointer %skia:sk-string) sk-str)
```
vs
```common-lisp
(%skia:get-family-name
     :const
     '(claw-utils:claw-pointer %skia:sk-typeface) typeface
     '(claw-utils:claw-pointer %skia:sk-string) sk-str)
```     